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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c016d4b33cde89638244364c860c721ef41fee7ce6504ab69a5d6b6836ae82e' 
  AND token = '/C6zSh181XUuGiDM89mAQUZnQDMU6+bCkKjBMeIIdDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}